What is the log4j vulnerability repair tutorial?

The steps to repair the log4j vulnerability: 1. Confirm the scope of the vulnerability; 2. Upgrade the Log4j version; 3. Temporarily disable JNDI lookup; 4. Replace the original JndiLookup class with the code; 5. Security data collection and monitoring. Detailed introduction: 1. To confirm the scope of the vulnerability, you first need to determine the scope of the vulnerability. You can determine whether it is affected by the vulnerability by checking the Log4j version used in the application and whether external dependencies are introduced. Common affected versions include Log4j 2.0 to 2.15.0-rc1 and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

Log4j is a widely used Java logging framework, but recent security vulnerabilities have brought security risks to many applications. In order to fix the Log4j vulnerability, the following steps can be taken.

Step 1: Confirm the scope of the vulnerability

First, you need to determine the scope of the vulnerability. You can determine if you are affected by the vulnerability by checking the version of Log4j used in your application and whether external dependencies have been introduced. Common affected versions include Log4j 2.0 through 2.15.0-rc1.

Step 2: Upgrade Log4j version

In order to fix Log4j vulnerabilities, the most direct way is to upgrade to the latest version. Currently, Log4j has officially released version 2.17.1, which fixes known security issues. You can upgrade by updating Maven dependencies or manually downloading the new Log4j JAR package.

Step 3: Temporarily disable JNDI lookup

If you cannot upgrade the Log4j version temporarily, you can temporarily disable the JNDI lookup function. Log4j vulnerabilities are mainly related to the JNDI lookup function, and disabling it can reduce security risks. This can be achieved by adding the following content in the Log4j configuration file:

<Configuration status="WARN">  
  <Appenders>  
    <Console name="Console" target="SYSTEM_OUT">  
      <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>  
    </Console>  
  </Appenders>  
  <Loggers>  
    <Root level="error">  
      <AppenderRef ref="Console"/>  
    </Root>  
  </Loggers>  
  <JNDIDisable>true</JNDIDisable>  
</Configuration>

Step 4: Code replacement of the original JndiLookup class

If for some reason the Log4j version cannot be upgraded or To disable JNDI lookup functionality, consider replacing the original JndiLookup class in your code. Replace the JndiLookup class in Log4j with your own implementation to ensure that it cannot be used maliciously. Note that this requires a deep understanding of how Log4j works and detailed code modifications.

Step 5: Security data collection and monitoring

After repairing the Log4j vulnerability, it is recommended to strengthen security data collection and monitoring. Since vulnerability fixes may cause certain problems in security data collection based on version number determination, it is necessary to pay close attention to security dynamics and promptly discover and deal with potential security risks. It is recommended to use professional log management tools for data collection, analysis and monitoring.

Note:

When dealing with Log4j vulnerabilities, be sure to follow best practices and avoid using features or components that are known to present security risks. Additionally, it’s important to keep your systems and applications updated and backed up so you can recover quickly if something goes wrong. If the problem cannot be solved or further assistance is required, please contact professional technical support or security experts for consultation and guidance.

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